Wheel-truing brake-shoe.



Patented Dec. 29, 1908.

Iilnrssrs THE uamus PETERS cm. wAsHmwan. n. c.

JUDSON M. GRIFFIN, OF DETROIT, MICHIGAN.

WHEEL-TRUING BRAKE-SHOE Specification of Letters Patent.

' Application filed June 22, 1908.

Patented Dec. 29, 1908.

Serial No. 439,669.

To all whom it may concern:

Be it known that I, JUnsoN M. GRIFFIN, a citizen of the United States,residing at Detroit, county of Wayne, State of Michigan, have invented acertain new and useful Improvement in VVheel-Truing Brake-Shoes, anddeclare the following to be a full, clear, and exact description of thesame, such as will enable others skilled in the art to which it pertainsto make and use the same,reference eing had to the accompanyingdrawings, which form a part of this specification.

This invention relates to wheel truing brake shoes; it has for itsobject an improved abrading device adapted to grind off the tread or theflange of a car wheel, and to make the car wheel round and true. inbrake shoes used for this purpose, there is usually employed a shell ofcast iron in which is formed and held a mass of abrading material. Asthe abrading material wears away, the device becomes useless, because inthe form commonly used, the shell itself, or some parts of it, are wornaway together with the abrading material, and when the latter is wornout, that part of the shoe constituting the back is useless and must bethrown away.

The object of this invention is to produce a brake shoe consisting of aback, provided with cavities in which can be inserted at any time theabrading blocks proper, the abrading block being provided with a lightand thin shell of metal, sufficient to hold it in place, and to enableit to be secured in place in the main brake shoe or back, and the frameof the block or sub-frame, as it will be called hereinafter, does notadd excessively to the weight of the abrading block, and is itselfcomparatively cheap and inexpensive, and may be thrown away when theabrading block proper has been so worn down that it can no longer beused. A new abrading block can be inserted in the brake shoe at anytime, and the brake shoe may be constantly in service, and is thereforemore economical and saving of time because light abrading blocks, withtheir sub-frames, may be transorted at much less expense than the heavybrake shoe charged or loaded with abrading material.

In the drawings :-Figure 1, is a longitudinal section of the brake shoe,with a number of blocks inserted in place. Fig. 2, is a sectionalperspective. Fig. 3, is a perspective of an abrading block.

The brake shoe 1 made to conform in curvature with the wheel with whichit is to be used, is formed with a plurality of sockets 2, 3, and 4,having dove-tailed overhanging parts, and with openings along one of theside faces for the reception of the subordinate frames or block holders5, 6 and 7. These subordinate holders are of light metal, and aresufliciently rigid to hold their form and to hold the blocks 8, 9 and10, each of which is provided with an enlarged portion to engage withinthe seat or cavity of the main brake shoe, and is suitably shaped to produce the proper abrasion of the wheel with which the blocks are to beused. Between consecutive blocks, as between blocks 8 and 9, is a space11 into which the material worn off from either the block or the wheeldrops, and each block is thus provided with a sharp cutting edge on itsforward side, which ever side may be forward, and with a clearance onits rear side which not only facilitates rapidity of cut, but causes theabrading shoeto wear more truly and regularly. Furthermore, if it befound that either of the blocks be worn irregularly, the position of theblocks in the head may be changed at any time. Each block is placed inits seat, and is kept from escaping from its seat by a rod 14 held inplace by eyes 15 on the face of the brake head. The block is preferablyentirely surrounded by the subcase, except on its cutting face.

What I claim is 1. An abrading brake shoe, having in combination a headprovided with sockets, subframes adapted to engage interchangeably insaid sockets, abrading blocks held in said subframes, and means forsecuring said subframes in place, substantially as described.

2. An abrading brake shoe, having in combination a back member providedwith sockets, a plurality of subordinate removable frames adapted toengage within said sockets, individual abrading blocks, each held by oneof said sockets in spaced relation from those adjoining and with itswearing face held clear of the concave face of the back, and anadjustable compression rod attached to the ends of the back, whereby thesubordinate frames and thereby the abrading blocks may be locked inosition With respect to the back, substantial y as described.

3. An abrading brake shoe, having in com- 5 bination a head providedWith sockets and With dovetail retaining members at each side of eachsocket, sub-frames adapted to engage interchangeably in said sockets, adetent engaging a sub-frame adapted to hold the same securely in placein its socket, sub- 10 J UDSON M. GRIFFIN.

Witnesses:

C. 0. JENNINGS, WILLIAM M. SWAN.

